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My Carrier 58dxc is making a loud noise

My carrier 58dxc is making a loud knocking noise and blowing out cold air. When I switch the thermostat to air the knocking stops and the unit works fine. It's only when I switch it to heat is when the knocking noise starts and the cold air comes out. Can anyone help.

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If your turning on heat and the unit is knocking and blowing cold air, your compressor is having problems in heat mode, could be reversing valve. A tech is needed in your situation. Getting the prob fixed right away will save you dollars..

Posted on Dec 03, 2008

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